Wu Fufei, Yang Bumeng, Luo Pengfei, Dong Shuangkuai, Wang Hongying, Zhang Qiuyue, Huang Zonghui, Jiang Jun, Cai Yang, Yang Shan, Xu Fajun
Guizhou Normal University, Guiyang 550025, China.
Materials (Basel). 2024 Oct 15;17(20):5037. doi: 10.3390/ma17205037.
As the most widely used building material, cement has attracted the attention of scholars because of its large carbon emission. To alleviate the problems of carbon emission and limited resource use caused by cement production, this study focuses on the performance of mortar after carbonization curing by regulating the composition of ternary binders. Testing involved mechanical parameters, carbon shrinkage, water absorption, hydration product, microstructure, adsorption of carbon dioxide, calcium carbonate content, and carbonization degree of mortar, as well as comparisons with the effect of calcium carbide slag and sintered red mud. We carried out several studies which demonstrated that carbonization curing and adjusting the content of calcium carbide slag and sintered red mud were beneficial to improve the mechanical properties, peak load displacement, slope, elastic energy, plastic energy, carbon shrinkage, carbon dioxide adsorption, calcium carbonate content, and carbonization degree of mortar, while the addition of calcium carbide slag and sintered red mud increased the water absorption of mortar, and the greater the dosage, the greater the water absorption. Meanwhile, adding 25%-50% calcium carbide slag and sintered red mud still had negative effects on the mechanical properties of mortar. But carbonation curing and the addition of calcium carbide slag and sintered red mud could promote the hydration reaction and consume calcium hydroxide formed by hydration to form calcium carbonate. When the dosage was 50%, the carbon dioxide adsorption capacity, calcium carbonate content, and carbonization degree of calcium carbide slag mortar were higher than those of sintered red mud mortar, which increased by 29.56%, 102.73%, and 28.84%, respectively. By comparison, calcium carbide slag and sintered red mud still showed superior carbon sequestration capacity, which was higher than fly ash and Bayer red mud. From the experiment, we came to realize that adjusting the composition of cementitious materials could realize the carbon sequestration of cement-based materials and promote the road toward low-carbon sustainable development of cement.
作为使用最广泛的建筑材料，水泥因其巨大的碳排放而受到学者们的关注。为缓解水泥生产造成的碳排放和资源利用受限问题，本研究通过调控三元胶凝材料的组成，聚焦碳化养护后砂浆的性能。测试涉及砂浆的力学参数、碳化收缩、吸水率、水化产物、微观结构、二氧化碳吸附量、碳酸钙含量和碳化程度，以及与电石渣和烧结赤泥效果的对比。我们开展了多项研究，结果表明碳化养护以及调整电石渣和烧结赤泥的含量有利于提高砂浆的力学性能、峰值荷载位移、斜率、弹性能、塑性能、碳化收缩、二氧化碳吸附量、碳酸钙含量和碳化程度，而添加电石渣和烧结赤泥会增加砂浆的吸水率，且用量越大，吸水率越高。同时，添加25%-50%的电石渣和烧结赤泥对砂浆的力学性能仍有负面影响。但碳化养护以及添加电石渣和烧结赤泥可促进水化反应，并消耗水化生成的氢氧化钙以形成碳酸钙。当用量为50%时，电石渣砂浆的二氧化碳吸附量、碳酸钙含量和碳化程度高于烧结赤泥砂浆，分别提高了29.56%、102.73%和28.84%。相比之下，电石渣和烧结赤泥仍表现出卓越的固碳能力，高于粉煤灰和拜耳赤泥。通过实验我们认识到，调整胶凝材料的组成可实现水泥基材料的固碳，并推动水泥向低碳可持续发展迈进。
